Improvement in insulating induction-coils



D. BROOKS. Insulating Induction Coils.

No. 210,987. Patented Dec. 17, 1878.

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Z V 1/ h/06 7 WM :44 PETERS. PHDYQ-LXTMUGRAPHER, WASHINGTON. D C

UNITED STATES PATENT OFFICE.

DAVID BROOKS, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN lNSULATlNG INDUCTION-SOILS.

Specification forming part of Letters Patent No. 210,987, dated December17, 1878; application filed October 25, 1878.

To all 107mm it may concern.-

Be itknown that I, DAVID BROOKS, of Philadelphia, Pennsylvania, haveinvented a new and useful Improvement in Insulating Induction-(Joils&c., of which the following is a specification The object of myinventionis to thoroughly insulate induction-coils or bobbins of wire ofelectrical instruments and protect them from the influence of the dampatmosphere. This object I attain in the manner which I will now proceedto describe, reference being had to the accompanying drawing, the figurein which il lustrates a method of carrying my invention into effect.

In the drawing, A is an ordinary induction coil or coils, or bobbins ofwire, w' it their positive and negative poles (a a, and B is avessel ofany suitable shape or size, containing an insulating-liquid, preferablyparaffine-oil. I immerse the bobbins or coils, as shown in the drawing,and the coils, being kept thus immersed in the liquid, are protectedfrom the influence of the damp atmosphere.

I claim as my invention- The within-described method of insulatinginduction-coils or bobbins of wire of electrical instruments-that is tosay, by immersing said bobbins or coils in a liquid insulatingsubstance, as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

DAVID BROOKS.

WVitnesses:

ALEX. PATTERSON, HARRY SMITH.

